lemon/lgf_reader.h
author Alpar Juttner <alpar@cs.elte.hu>
Mon, 05 May 2008 11:41:30 +0200
changeset 155 5c3604513ed0
parent 140 356930927a71
child 156 e561aa7675de
permissions -rw-r--r--
Update .hgignore
     1 /* -*- C++ -*-
     2  *
     3  * This file is a part of LEMON, a generic C++ optimization library
     4  *
     5  * Copyright (C) 2003-2008
     6  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
     7  * (Egervary Research Group on Combinatorial Optimization, EGRES).
     8  *
     9  * Permission to use, modify and distribute this software is granted
    10  * provided that this copyright notice appears in all copies. For
    11  * precise terms see the accompanying LICENSE file.
    12  *
    13  * This software is provided "AS IS" with no warranty of any kind,
    14  * express or implied, and with no claim as to its suitability for any
    15  * purpose.
    16  *
    17  */
    18 
    19 ///\ingroup lemon_io
    20 ///\file
    21 ///\brief Lemon Graph Format reader.
    22 
    23 
    24 #ifndef LEMON_LGF_READER_H
    25 #define LEMON_LGF_READER_H
    26 
    27 #include <iostream>
    28 #include <fstream>
    29 #include <sstream>
    30 
    31 #include <set>
    32 #include <map>
    33 
    34 #include <lemon/assert.h>
    35 #include <lemon/graph_utils.h>
    36 
    37 #include <lemon/lgf_writer.h>
    38 
    39 #include <lemon/concept_check.h>
    40 #include <lemon/concepts/maps.h>
    41 
    42 namespace lemon {
    43 
    44   namespace _reader_bits {
    45 
    46     template <typename Value>
    47     struct DefaultConverter {
    48       Value operator()(const std::string& str) {
    49 	std::istringstream is(str);
    50 	Value value;
    51 	is >> value;
    52 
    53 	char c;
    54 	if (is >> std::ws >> c) {
    55 	  throw DataFormatError("Remaining characters in token");
    56 	}
    57 	return value;
    58       }
    59     };
    60 
    61     template <>
    62     struct DefaultConverter<std::string> {
    63       std::string operator()(const std::string& str) {
    64 	return str;
    65       }
    66     };
    67 
    68     template <typename _Item>    
    69     class MapStorageBase {
    70     public:
    71       typedef _Item Item;
    72 
    73     public:
    74       MapStorageBase() {}
    75       virtual ~MapStorageBase() {}
    76 
    77       virtual void set(const Item& item, const std::string& value) = 0;
    78 
    79     };
    80 
    81     template <typename _Item, typename _Map, 
    82 	      typename _Converter = DefaultConverter<typename _Map::Value> >
    83     class MapStorage : public MapStorageBase<_Item> {
    84     public:
    85       typedef _Map Map;
    86       typedef _Converter Converter;
    87       typedef _Item Item;
    88       
    89     private:
    90       Map& _map;
    91       Converter _converter;
    92 
    93     public:
    94       MapStorage(Map& map, const Converter& converter = Converter()) 
    95 	: _map(map), _converter(converter) {}
    96       virtual ~MapStorage() {}
    97 
    98       virtual void set(const Item& item ,const std::string& value) {
    99 	_map.set(item, _converter(value));
   100       }
   101     };
   102 
   103     class ValueStorageBase {
   104     public:
   105       ValueStorageBase() {}
   106       virtual ~ValueStorageBase() {}
   107 
   108       virtual void set(const std::string&) = 0;
   109     };
   110 
   111     template <typename _Value, typename _Converter = DefaultConverter<_Value> >
   112     class ValueStorage : public ValueStorageBase {
   113     public:
   114       typedef _Value Value;
   115       typedef _Converter Converter;
   116 
   117     private:
   118       Value& _value;
   119       Converter _converter;
   120 
   121     public:
   122       ValueStorage(Value& value, const Converter& converter = Converter())
   123  	: _value(value), _converter(converter) {}
   124 
   125       virtual void set(const std::string& value) {
   126 	_value = _converter(value);
   127       }
   128     };
   129 
   130     template <typename Value>
   131     struct MapLookUpConverter {
   132       const std::map<std::string, Value>& _map;
   133 
   134       MapLookUpConverter(const std::map<std::string, Value>& map)
   135         : _map(map) {}
   136 
   137       Value operator()(const std::string& str) {
   138         typename std::map<std::string, Value>::const_iterator it =
   139           _map.find(str);
   140         if (it == _map.end()) {
   141           std::ostringstream msg;
   142           msg << "Item not found: " << str;
   143           throw DataFormatError(msg.str().c_str());
   144         }
   145         return it->second;
   146       }
   147     };
   148 
   149     bool isWhiteSpace(char c) {
   150       return c == ' ' || c == '\t' || c == '\v' || 
   151         c == '\n' || c == '\r' || c == '\f'; 
   152     }
   153     
   154     bool isOct(char c) {
   155       return '0' <= c && c <='7'; 
   156     }
   157     
   158     int valueOct(char c) {
   159       LEMON_ASSERT(isOct(c), "The character is not octal.");
   160       return c - '0';
   161     }
   162 
   163     bool isHex(char c) {
   164       return ('0' <= c && c <= '9') || 
   165 	('a' <= c && c <= 'z') || 
   166 	('A' <= c && c <= 'Z'); 
   167     }
   168     
   169     int valueHex(char c) {
   170       LEMON_ASSERT(isHex(c), "The character is not hexadecimal.");
   171       if ('0' <= c && c <= '9') return c - '0';
   172       if ('a' <= c && c <= 'z') return c - 'a' + 10;
   173       return c - 'A' + 10;
   174     }
   175 
   176     bool isIdentifierFirstChar(char c) {
   177       return ('a' <= c && c <= 'z') ||
   178 	('A' <= c && c <= 'Z') || c == '_';
   179     }
   180 
   181     bool isIdentifierChar(char c) {
   182       return isIdentifierFirstChar(c) ||
   183 	('0' <= c && c <= '9');
   184     }
   185 
   186     char readEscape(std::istream& is) {
   187       char c;
   188       if (!is.get(c))
   189 	throw DataFormatError("Escape format error");
   190 
   191       switch (c) {
   192       case '\\':
   193 	return '\\';
   194       case '\"':
   195 	return '\"';
   196       case '\'':
   197 	return '\'';
   198       case '\?':
   199 	return '\?';
   200       case 'a':
   201 	return '\a';
   202       case 'b':
   203 	return '\b';
   204       case 'f':
   205 	return '\f';
   206       case 'n':
   207 	return '\n';
   208       case 'r':
   209 	return '\r';
   210       case 't':
   211 	return '\t';
   212       case 'v':
   213 	return '\v';
   214       case 'x':
   215 	{
   216 	  int code;
   217 	  if (!is.get(c) || !isHex(c)) 
   218 	    throw DataFormatError("Escape format error");
   219 	  else if (code = valueHex(c), !is.get(c) || !isHex(c)) is.putback(c);
   220 	  else code = code * 16 + valueHex(c);
   221 	  return code;
   222 	}
   223       default:
   224 	{
   225 	  int code;
   226 	  if (!isOct(c)) 
   227 	    throw DataFormatError("Escape format error");
   228 	  else if (code = valueOct(c), !is.get(c) || !isOct(c)) 
   229 	    is.putback(c);
   230 	  else if (code = code * 8 + valueOct(c), !is.get(c) || !isOct(c)) 
   231 	    is.putback(c);
   232 	  else code = code * 8 + valueOct(c);
   233 	  return code;
   234 	}	      
   235       } 
   236     }
   237     
   238     std::istream& readToken(std::istream& is, std::string& str) {
   239       std::ostringstream os;
   240 
   241       char c;
   242       is >> std::ws;
   243       
   244       if (!is.get(c)) 
   245 	return is;
   246 
   247       if (c == '\"') {
   248 	while (is.get(c) && c != '\"') {
   249 	  if (c == '\\') 
   250 	    c = readEscape(is);
   251 	  os << c;
   252 	}
   253 	if (!is) 
   254 	  throw DataFormatError("Quoted format error");
   255       } else {
   256 	is.putback(c);
   257 	while (is.get(c) && !isWhiteSpace(c)) {
   258 	  if (c == '\\') 
   259 	    c = readEscape(is);
   260 	  os << c;
   261 	}
   262 	if (!is) {
   263 	  is.clear();
   264 	} else {
   265 	  is.putback(c);
   266 	}
   267       }
   268       str = os.str();
   269       return is;
   270     }
   271 
   272     std::istream& readIdentifier(std::istream& is, std::string& str) {
   273       std::ostringstream os;
   274 
   275       char c;
   276       is >> std::ws;
   277       
   278       if (!is.get(c))
   279 	return is;
   280 
   281       if (!isIdentifierFirstChar(c))
   282 	throw DataFormatError("Wrong char in identifier");
   283       
   284       os << c;
   285       
   286       while (is.get(c) && !isWhiteSpace(c)) {
   287 	if (!isIdentifierChar(c)) 
   288 	  throw DataFormatError("Wrong char in identifier");	  
   289 	os << c;
   290       }
   291       if (!is) is.clear();
   292      
   293       str = os.str();
   294       return is;
   295     }
   296     
   297   }
   298   
   299   /// \e
   300   template <typename _Digraph>
   301   class DigraphReader {
   302   public:
   303 
   304     typedef _Digraph Digraph;
   305     TEMPLATE_DIGRAPH_TYPEDEFS(Digraph);
   306     
   307   private:
   308 
   309 
   310     std::istream* _is;
   311     bool local_is;
   312 
   313     Digraph& _digraph;
   314 
   315     std::string _nodes_caption;
   316     std::string _arcs_caption;
   317     std::string _attributes_caption;
   318 
   319     typedef std::map<std::string, Node> NodeIndex;
   320     NodeIndex _node_index;
   321     typedef std::map<std::string, Arc> ArcIndex;
   322     ArcIndex _arc_index;
   323     
   324     typedef std::vector<std::pair<std::string, 
   325       _reader_bits::MapStorageBase<Node>*> > NodeMaps;    
   326     NodeMaps _node_maps; 
   327 
   328     typedef std::vector<std::pair<std::string,
   329       _reader_bits::MapStorageBase<Arc>*> >ArcMaps;
   330     ArcMaps _arc_maps;
   331 
   332     typedef std::multimap<std::string, _reader_bits::ValueStorageBase*> 
   333       Attributes;
   334     Attributes _attributes;
   335 
   336     bool _use_nodes;
   337     bool _use_arcs;
   338 
   339     int line_num;
   340     std::istringstream line;
   341 
   342   public:
   343 
   344     /// \e
   345     DigraphReader(std::istream& is, Digraph& digraph) 
   346       : _is(&is), local_is(false), _digraph(digraph),
   347 	_use_nodes(false), _use_arcs(false) {}
   348 
   349     /// \e
   350     DigraphReader(const std::string& fn, Digraph& digraph) 
   351       : _is(new std::ifstream(fn.c_str())), local_is(true), _digraph(digraph),
   352     	_use_nodes(false), _use_arcs(false) {}
   353 
   354 
   355     /// \e
   356     DigraphReader(const char* fn, Digraph& digraph) 
   357       : _is(new std::ifstream(fn)), local_is(true), _digraph(digraph),
   358     	_use_nodes(false), _use_arcs(false) {}
   359 
   360     /// \e
   361     DigraphReader(DigraphReader& other) 
   362       : _is(other._is), local_is(other.local_is), _digraph(other._digraph),
   363 	_use_nodes(other._use_nodes), _use_arcs(other._use_arcs) {
   364 
   365       other.is = 0;
   366       other.local_is = false;
   367       
   368       _node_index.swap(other._node_index);
   369       _arc_index.swap(other._arc_index);
   370 
   371       _node_maps.swap(other._node_maps);
   372       _arc_maps.swap(other._arc_maps);
   373       _attributes.swap(other._attributes);
   374 
   375       _nodes_caption = other._nodes_caption;
   376       _arcs_caption = other._arcs_caption;
   377       _attributes_caption = other._attributes_caption;
   378     }
   379 
   380     /// \e
   381     ~DigraphReader() {
   382       for (typename NodeMaps::iterator it = _node_maps.begin(); 
   383 	   it != _node_maps.end(); ++it) {
   384 	delete it->second;
   385       }
   386 
   387       for (typename ArcMaps::iterator it = _arc_maps.begin(); 
   388 	   it != _arc_maps.end(); ++it) {
   389 	delete it->second;
   390       }
   391 
   392       for (typename Attributes::iterator it = _attributes.begin(); 
   393 	   it != _attributes.end(); ++it) {
   394 	delete it->second;
   395       }
   396 
   397       if (local_is) {
   398 	delete _is;
   399       }
   400 
   401     }
   402 
   403   private:
   404     
   405     DigraphReader& operator=(const DigraphReader&);
   406 
   407   public:
   408 
   409     /// \e
   410     template <typename Map>
   411     DigraphReader& nodeMap(const std::string& caption, Map& map) {
   412       checkConcept<concepts::WriteMap<Node, typename Map::Value>, Map>();
   413       _reader_bits::MapStorageBase<Node>* storage = 
   414 	new _reader_bits::MapStorage<Node, Map>(map);
   415       _node_maps.push_back(std::make_pair(caption, storage));
   416       return *this;
   417     }
   418 
   419     /// \e
   420     template <typename Map, typename Converter>
   421     DigraphReader& nodeMap(const std::string& caption, Map& map, 
   422 			   const Converter& converter = Converter()) {
   423       checkConcept<concepts::WriteMap<Node, typename Map::Value>, Map>();
   424       _reader_bits::MapStorageBase<Node>* storage = 
   425 	new _reader_bits::MapStorage<Node, Map, Converter>(map, converter);
   426       _node_maps.push_back(std::make_pair(caption, storage));
   427       return *this;
   428     }
   429 
   430     /// \e
   431     template <typename Map>
   432     DigraphReader& arcMap(const std::string& caption, Map& map) {
   433       checkConcept<concepts::WriteMap<Arc, typename Map::Value>, Map>();
   434       _reader_bits::MapStorageBase<Arc>* storage = 
   435 	new _reader_bits::MapStorage<Arc, Map>(map);
   436       _arc_maps.push_back(std::make_pair(caption, storage));
   437       return *this;
   438     }
   439 
   440     /// \e
   441     template <typename Map, typename Converter>
   442     DigraphReader& arcMap(const std::string& caption, Map& map, 
   443 			  const Converter& converter = Converter()) {
   444       checkConcept<concepts::WriteMap<Arc, typename Map::Value>, Map>();
   445       _reader_bits::MapStorageBase<Arc>* storage = 
   446 	new _reader_bits::MapStorage<Arc, Map, Converter>(map, converter);
   447       _arc_maps.push_back(std::make_pair(caption, storage));
   448       return *this;
   449     }
   450 
   451     /// \e
   452     template <typename Value>
   453     DigraphReader& attribute(const std::string& caption, Value& value) {
   454       _reader_bits::ValueStorageBase* storage = 
   455 	new _reader_bits::ValueStorage<Value>(value);
   456       _attributes.insert(std::make_pair(caption, storage));
   457       return *this;
   458     }
   459 
   460     /// \e
   461     template <typename Value, typename Converter>
   462     DigraphReader& attribute(const std::string& caption, Value& value, 
   463 			     const Converter& converter = Converter()) {
   464       _reader_bits::ValueStorageBase* storage = 
   465 	new _reader_bits::ValueStorage<Value, Converter>(value, converter);
   466       _attributes.insert(std::make_pair(caption, storage));
   467       return *this;
   468     }
   469 
   470     /// \e
   471     DigraphReader& node(const std::string& caption, Node& node) {
   472       typedef _reader_bits::MapLookUpConverter<Node> Converter;
   473       Converter converter(_node_index);
   474       _reader_bits::ValueStorageBase* storage = 
   475 	new _reader_bits::ValueStorage<Node, Converter>(node, converter);
   476       _attributes.insert(std::make_pair(caption, storage));
   477       return *this;
   478     }
   479 
   480     /// \e
   481     DigraphReader& arc(const std::string& caption, Arc& arc) {
   482       typedef _reader_bits::MapLookUpConverter<Arc> Converter;
   483       Converter converter(_arc_index);
   484       _reader_bits::ValueStorageBase* storage = 
   485 	new _reader_bits::ValueStorage<Arc, Converter>(arc, converter);
   486       _attributes.insert(std::make_pair(caption, storage));
   487       return *this;
   488     }
   489 
   490     /// \e
   491     DigraphReader& nodes(const std::string& caption) {
   492       _nodes_caption = caption;
   493       return *this;
   494     }
   495 
   496     /// \e
   497     DigraphReader& arcs(const std::string& caption) {
   498       _arcs_caption = caption;
   499       return *this;
   500     }
   501 
   502     /// \e
   503     DigraphReader& attributes(const std::string& caption) {
   504       _attributes_caption = caption;
   505       return *this;
   506     }
   507 
   508     /// \e
   509     template <typename Map>
   510     DigraphReader& useNodes(const Map& map) {
   511       checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
   512       LEMON_ASSERT(!_use_nodes, "Multiple usage of useNodes() member"); 
   513       _use_nodes = true;
   514       _writer_bits::DefaultConverter<typename Map::Value> converter;
   515       for (NodeIt n(_digraph); n != INVALID; ++n) {
   516 	_node_index.insert(std::make_pair(converter(map[n]), n));
   517       }
   518       return *this;
   519     }
   520 
   521     /// \e
   522     template <typename Map, typename Converter>
   523     DigraphReader& useNodes(const Map& map, 
   524 			    const Converter& converter = Converter()) {
   525       checkConcept<concepts::ReadMap<Node, typename Map::Value>, Map>();
   526       LEMON_ASSERT(!_use_nodes, "Multiple usage of useNodes() member"); 
   527       _use_nodes = true;
   528       for (NodeIt n(_digraph); n != INVALID; ++n) {
   529 	_node_index.insert(std::make_pair(converter(map[n]), n));
   530       }
   531       return *this;
   532     }
   533 
   534     /// \e
   535     template <typename Map>
   536     DigraphReader& useArcs(const Map& map) {
   537       checkConcept<concepts::ReadMap<Arc, typename Map::Value>, Map>();
   538       LEMON_ASSERT(!_use_arcs, "Multiple usage of useArcs() member");
   539       _use_arcs = true;
   540       _writer_bits::DefaultConverter<typename Map::Value> converter;
   541       for (ArcIt a(_digraph); a != INVALID; ++a) {
   542 	_arc_index.insert(std::make_pair(converter(map[a]), a));
   543       }
   544       return *this;
   545     }
   546 
   547     /// \e
   548     template <typename Map, typename Converter>
   549     DigraphReader& useArcs(const Map& map, 
   550 			    const Converter& converter = Converter()) {
   551       checkConcept<concepts::ReadMap<Arc, typename Map::Value>, Map>();
   552       LEMON_ASSERT(!_use_arcs, "Multiple usage of useArcs() member"); 
   553       _use_arcs = true;
   554       for (ArcIt a(_digraph); a != INVALID; ++a) {
   555 	_arc_index.insert(std::make_pair(converter(map[a]), a));
   556       }
   557       return *this;
   558     }
   559 
   560   private:
   561 
   562     bool readLine() {
   563       std::string str;
   564       while(++line_num, std::getline(*_is, str)) {
   565 	line.clear(); line.str(str);
   566 	char c;
   567 	if (line >> std::ws >> c && c != '#') {
   568 	  line.putback(c);
   569 	  return true;
   570 	}
   571       }
   572       return false;
   573     }
   574 
   575     bool readSuccess() {
   576       return static_cast<bool>(*_is);
   577     }
   578     
   579     void skipSection() {
   580       char c;
   581       while (readSuccess() && line >> c && c != '@') {
   582 	readLine();
   583       }
   584       line.putback(c);
   585     }
   586 
   587     void readNodes() {
   588 
   589       std::vector<int> map_index(_node_maps.size());
   590       int map_num, label_index;
   591 
   592       if (!readLine()) 
   593 	throw DataFormatError("Cannot find map captions");
   594       
   595       {
   596 	std::map<std::string, int> maps;
   597 	
   598 	std::string map;
   599 	int index = 0;
   600 	while (_reader_bits::readIdentifier(line, map)) {
   601 	  if (maps.find(map) != maps.end()) {
   602 	    std::ostringstream msg;
   603 	    msg << "Multiple occurence of node map: " << map;
   604 	    throw DataFormatError(msg.str().c_str());
   605 	  }
   606 	  maps.insert(std::make_pair(map, index));
   607 	  ++index;
   608 	}
   609 	
   610 	for (int i = 0; i < static_cast<int>(_node_maps.size()); ++i) {
   611 	  std::map<std::string, int>::iterator jt = 
   612 	    maps.find(_node_maps[i].first);
   613 	  if (jt == maps.end()) {
   614 	    std::ostringstream msg;
   615 	    msg << "Map not found in file: " << _node_maps[i].first;
   616 	    throw DataFormatError(msg.str().c_str());
   617 	  }
   618 	  map_index[i] = jt->second;
   619 	}
   620 
   621 	{
   622 	  std::map<std::string, int>::iterator jt = maps.find("label");
   623 	  if (jt == maps.end())
   624 	    throw DataFormatError("Label map not found in file");
   625 	  label_index = jt->second;
   626 	}
   627 	map_num = maps.size();
   628       }
   629 
   630       char c;
   631       while (readLine() && line >> c && c != '@') {
   632 	line.putback(c);
   633 
   634 	std::vector<std::string> tokens(map_num);
   635 	for (int i = 0; i < map_num; ++i) {
   636 	  if (!_reader_bits::readToken(line, tokens[i])) {
   637 	    std::ostringstream msg;
   638 	    msg << "Column not found (" << i + 1 << ")";
   639 	    throw DataFormatError(msg.str().c_str());
   640 	  }
   641 	}
   642 	if (line >> std::ws >> c)
   643 	  throw DataFormatError("Extra character on the end of line");
   644 	
   645 	Node n;
   646 	if (!_use_nodes) {
   647 	  n = _digraph.addNode();
   648 	  _node_index.insert(std::make_pair(tokens[label_index], n));
   649 	} else {
   650 	  typename std::map<std::string, Node>::iterator it =
   651 	    _node_index.find(tokens[label_index]);
   652 	  if (it == _node_index.end()) {
   653 	    std::ostringstream msg;
   654 	    msg << "Node with label not found: " << tokens[label_index];
   655 	    throw DataFormatError(msg.str().c_str());	    
   656 	  }
   657 	  n = it->second;
   658 	}
   659 
   660 	for (int i = 0; i < static_cast<int>(_node_maps.size()); ++i) {
   661 	  _node_maps[i].second->set(n, tokens[map_index[i]]);
   662 	}
   663 
   664       }
   665       if (readSuccess()) {
   666 	line.putback(c);
   667       }
   668     }
   669 
   670     void readArcs() {
   671 
   672       std::vector<int> map_index(_arc_maps.size());
   673       int map_num, label_index;
   674 
   675       if (!readLine()) 
   676 	throw DataFormatError("Cannot find map captions");
   677       
   678       {
   679 	std::map<std::string, int> maps;
   680 	
   681 	std::string map;
   682 	int index = 0;
   683 	while (_reader_bits::readIdentifier(line, map)) {
   684 	  if (maps.find(map) != maps.end()) {
   685 	    std::ostringstream msg;
   686 	    msg << "Multiple occurence of arc map: " << map;
   687 	    throw DataFormatError(msg.str().c_str());
   688 	  }
   689 	  maps.insert(std::make_pair(map, index));
   690 	  ++index;
   691 	}
   692 	
   693 	for (int i = 0; i < static_cast<int>(_arc_maps.size()); ++i) {
   694 	  std::map<std::string, int>::iterator jt = 
   695 	    maps.find(_arc_maps[i].first);
   696 	  if (jt == maps.end()) {
   697 	    std::ostringstream msg;
   698 	    msg << "Map not found in file: " << _arc_maps[i].first;
   699 	    throw DataFormatError(msg.str().c_str());
   700 	  }
   701 	  map_index[i] = jt->second;
   702 	}
   703 
   704 	{
   705 	  std::map<std::string, int>::iterator jt = maps.find("label");
   706 	  if (jt == maps.end())
   707 	    throw DataFormatError("Label map not found in file");
   708 	  label_index = jt->second;
   709 	}
   710 	map_num = maps.size();
   711       }
   712 
   713       char c;
   714       while (readLine() && line >> c && c != '@') {
   715 	line.putback(c);
   716 
   717 	std::string source_token;
   718 	std::string target_token;
   719 
   720 	if (!_reader_bits::readToken(line, source_token))
   721 	  throw DataFormatError("Source not found");
   722 
   723 	if (!_reader_bits::readToken(line, target_token))
   724 	  throw DataFormatError("Source not found");
   725 	
   726 	std::vector<std::string> tokens(map_num);
   727 	for (int i = 0; i < map_num; ++i) {
   728 	  if (!_reader_bits::readToken(line, tokens[i])) {
   729 	    std::ostringstream msg;
   730 	    msg << "Column not found (" << i + 1 << ")";
   731 	    throw DataFormatError(msg.str().c_str());
   732 	  }
   733 	}
   734 	if (line >> std::ws >> c)
   735 	  throw DataFormatError("Extra character on the end of line");
   736 	
   737 	Arc a;
   738 	if (!_use_arcs) {
   739 
   740           typename NodeIndex::iterator it;
   741  
   742           it = _node_index.find(source_token);
   743           if (it == _node_index.end()) {
   744             std::ostringstream msg;
   745             msg << "Item not found: " << source_token;
   746             throw DataFormatError(msg.str().c_str());
   747           }
   748           Node source = it->second;
   749 
   750           it = _node_index.find(target_token);
   751           if (it == _node_index.end()) {       
   752             std::ostringstream msg;            
   753             msg << "Item not found: " << target_token;
   754             throw DataFormatError(msg.str().c_str());
   755           }                                          
   756           Node target = it->second;                            
   757 
   758 	  a = _digraph.addArc(source, target);
   759 	  _arc_index.insert(std::make_pair(tokens[label_index], a));
   760 	} else {
   761 	  typename std::map<std::string, Arc>::iterator it =
   762 	    _arc_index.find(tokens[label_index]);
   763 	  if (it == _arc_index.end()) {
   764 	    std::ostringstream msg;
   765 	    msg << "Arc with label not found: " << tokens[label_index];
   766 	    throw DataFormatError(msg.str().c_str());	    
   767 	  }
   768 	  a = it->second;
   769 	}
   770 
   771 	for (int i = 0; i < static_cast<int>(_arc_maps.size()); ++i) {
   772 	  _arc_maps[i].second->set(a, tokens[map_index[i]]);
   773 	}
   774 
   775       }
   776       if (readSuccess()) {
   777 	line.putback(c);
   778       }
   779     }
   780 
   781     void readAttributes() {
   782 
   783       std::set<std::string> read_attr;
   784 
   785       char c;
   786       while (readLine() && line >> c && c != '@') {
   787 	line.putback(c);
   788 	
   789 	std::string attr, token;
   790 	if (!_reader_bits::readIdentifier(line, attr))
   791 	  throw DataFormatError("Attribute name not found");
   792 	if (!_reader_bits::readToken(line, token))
   793 	  throw DataFormatError("Attribute value not found");
   794 	if (line >> c)
   795 	  throw DataFormatError("Extra character on the end of line");	  
   796 
   797 	{
   798 	  std::set<std::string>::iterator it = read_attr.find(attr);
   799 	  if (it != read_attr.end()) {
   800 	    std::ostringstream msg;
   801 	    msg << "Multiple occurence of attribute " << attr;
   802 	    throw DataFormatError(msg.str().c_str());
   803 	  }
   804 	  read_attr.insert(attr);
   805 	}
   806 	
   807 	{
   808 	  typename Attributes::iterator it = _attributes.lower_bound(attr);
   809 	  while (it != _attributes.end() && it->first == attr) {
   810 	    it->second->set(token);
   811 	    ++it;
   812 	  }
   813 	}
   814 
   815       }
   816       if (readSuccess()) {
   817 	line.putback(c);
   818       }
   819       for (typename Attributes::iterator it = _attributes.begin();
   820 	   it != _attributes.end(); ++it) {
   821 	if (read_attr.find(it->first) == read_attr.end()) {
   822 	  std::ostringstream msg;
   823 	  msg << "Attribute not found in file: " << it->first;
   824 	  throw DataFormatError(msg.str().c_str());
   825 	}	
   826       }
   827     }
   828 
   829   public:
   830     
   831     /// \e
   832     void run() {
   833       
   834       LEMON_ASSERT(_is != 0, "This reader assigned to an other reader");
   835       
   836       bool nodes_done = false;
   837       bool arcs_done = false;
   838       bool attributes_done = false;
   839 
   840       line_num = 0;      
   841       readLine();
   842 
   843       while (readSuccess()) {
   844 	skipSection();
   845 	try {
   846 	  char c;
   847 	  std::string section, caption;
   848 	  line >> c;
   849 	  _reader_bits::readIdentifier(line, section);
   850 	  _reader_bits::readIdentifier(line, caption);
   851 
   852 	  if (line >> c) 
   853 	    throw DataFormatError("Extra character on the end of line");
   854 
   855 	  if (section == "nodes" && !nodes_done) {
   856 	    if (_nodes_caption.empty() || _nodes_caption == caption) {
   857 	      readNodes();
   858 	      nodes_done = true;
   859 	    }
   860 	  } else if ((section == "arcs" || section == "edges") && 
   861 		     !arcs_done) {
   862 	    if (_arcs_caption.empty() || _arcs_caption == caption) {
   863 	      readArcs();
   864 	      arcs_done = true;
   865 	    }
   866 	  } else if (section == "attributes" && !attributes_done) {
   867 	    if (_attributes_caption.empty() || _attributes_caption == caption) {
   868 	      readAttributes();
   869 	      attributes_done = true;
   870 	    }
   871 	  } else {
   872 	    readLine();
   873 	    skipSection();
   874 	  }
   875 	} catch (DataFormatError& error) {
   876 	  error.line(line_num);
   877 	  throw;
   878 	}	
   879       }
   880 
   881       if (!nodes_done) {
   882 	throw DataFormatError("Section @nodes not found");
   883       }
   884 
   885       if (!arcs_done) {
   886 	throw DataFormatError("Section @arcs not found");
   887       }
   888 
   889       if (!attributes_done && !_attributes.empty()) {
   890 	throw DataFormatError("Section @attributes not found");
   891       }
   892 
   893     }
   894     
   895   };
   896 
   897   template <typename Digraph>
   898   DigraphReader<Digraph> digraphReader(std::istream& is, Digraph& digraph) {
   899     return DigraphReader<Digraph>(is, digraph);
   900   }
   901 
   902   template <typename Digraph>
   903   DigraphReader<Digraph> digraphReader(const std::string& fn, 
   904 				       Digraph& digraph) {
   905     return DigraphReader<Digraph>(fn, digraph);
   906   }
   907 
   908   template <typename Digraph>
   909   DigraphReader<Digraph> digraphReader(const char* fn, Digraph& digraph) {
   910     return DigraphReader<Digraph>(fn, digraph);
   911   }
   912 }
   913 
   914 #endif